"He was stumbling a couple of times before he fell," Singleton told GulfLive.com on Saturday, noting that he initially thought the running back had suffered from a concussion. "The trainers came out and rolled him over. When I came up, his eyes were open and he took a deep breath. And I think that was his last one.

"He blocked his man, and then a (defender) came across and hit him in the arm or shoulder area and knocked him to the ground. It was not a real hard hit or anything, nothing to the head or anything like that. ... We saw on tape that he got up and made about 15 steps toward where the play was being run and just collapsed."